The Asics GEL-DS trainer 21 running shoes combine the perfect blend of speed and stability. Lightweight Dynamic DuoMax® Support System and Propulsion Trusstic® Technology provide a stable ride while the new Seamless Upper creates a better and more comfortable fit. With the use of seamless materials, the potential for irritation and friction caused by traditional stitches and seams is reduced. This provides a better and more comfortable fit. Equipped with Asics Impact Guidance System which is a technical design based on the philosophy of the human body that allows the foot to perform a more natural heel to toe movement.To give comfort to the wearer, Solyte midsole technology is used which is a more lighter weight midsole compound than Asics standard EVA and spEVA®. It provides more cushioning, durability and responsiveness.Featuring a COMFORDRY™ sockliner which is a premium sockliner that features higher rebound properties while providing fantastic moisture management and a high level of breathability. Featuring Dynamic Duomax™ support system which is a higher density EVA material which helps to reduce the effects of overpronation and also enhances the normal movements of the foot. Pronation is how a runner's rolls medially between footfall and toe-off. Matching a shoe's properties with the runner's running style will increase comfort. running efficiently, and contribute to decreasing the risk of injury. Rearfoot and forefoot gel® cushioning system which reduces shock during impact and toe-off phases, and allows movement in multiple planes as the foot transitions through the gait cycle. With the heel clutching system™ technology, it has a exoskeletal heel counter which provides improved support and creates an improved heel fitting environment.Featuring various technologies in the outsole, one being AHar technology (Asics high abrasion rubber), which is a tough rubber compound used in critical areas of the outsole for exceptional durability.Equipped with guidance line® midsole technology which is a vertical flex groove that decouples the tooling along the line of progression for enhanced gait while the trusstic system® reduces the weight of the sole unit while retaining the structural integrity of the shoes.The Asics GEL-DS trainer 21 features Durasponge® and Duosole® on the outsole. Durasponge® is a blown AHAR® rubber compound for enhanced cushioning and durability in the forefoot. The Duosole® reduces weight and enhances flexibility while maintaining traction and durability. Seamless material upper - Helps reduce irritation and friction providing a more comfortable fit. Impact guidance system - Allows the foot to perform a more natural heel to toe movement. Solyte midsole technology - Provides cushioning, durability and responsiveness. COMFORDRY™ sockliner - Provides moisture management and breathability. Dynamic duomax™ support system - Helps to reduce the effects of overpronation. Rearfoot and forefoot gel® cushioning system - Reduces shock during impact. Heel clutching system™ technology - Provides support and creates an improved heel fit. AHar technology - Tough rubber compound which provides durability. Guidance line® midsole technology - Enhanced gait. Trusstic system® - Reduces the weight of the sole while retaining structure. Durasponge® - Enhanced cushioning and durability. Duosole® - Reduces weight and enhances flexibility while maintaining traction and durability. Forefoot height - 10.5mmHeel height - 20.5mmWeight - 9.1oz (258g)Goto Next Products:Mens Running - ASICS GEL-DS Trainer 21 Running Shoes Orange